Headline
GHSA-9h6g-pr28-7cqp: nodemailer ReDoS when trying to send a specially crafted email
Summary
A ReDoS vulnerability occurs when nodemailer tries to parse img files with the parameter attachDataUrls set, causing the stuck of event loop.
Another flaw was found when nodemailer tries to parse an attachments with a embedded file, causing the stuck of event loop.
Details
Regex: /^data:((?:[^;];)(?:[^,])),(.)$/
Path: compile -> getAttachments -> _processDataUrl
Regex: /(<img\b[^>]* src\s=[\s"’])(data:([^;]+);[^"’>\s]+)/
Path: _convertDataImages
PoC
https://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6 https://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698
Impact
ReDoS causes the event loop to stuck a specially crafted evil email can cause this problem.
Package
npm nodemailer (npm)
Affected versions
<= 6.9.8
Patched versions
None
Description
Summary
A ReDoS vulnerability occurs when nodemailer tries to parse img files with the parameter attachDataUrls set, causing the stuck of event loop.
Another flaw was found when nodemailer tries to parse an attachments with a embedded file, causing the stuck of event loop.
Details
Regex: /^data:((?:[^;];)(?:[^,])),(.)$/
Path: compile -> getAttachments -> _processDataUrl
Regex: /(<img\b[^>]* src\s*=[\s"’]*)(data:([^;]+);[^"’>\s]+)/
Path: _convertDataImages
PoC
https://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6
https://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698
Impact
ReDoS causes the event loop to stuck a specially crafted evil email can cause this problem.
References
- GHSA-9h6g-pr28-7cqp
- https://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6
- https://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698
andris9 published to nodemailer/nodemailer
Jan 31, 2024
Published to the GitHub Advisory Database
Jan 31, 2024
Reviewed
Jan 31, 2024
Last updated
Jan 31, 2024